My latest addiction, last.fm. (Thanks to Judy!!)
Once you sign up and download/install the software, last.fm starts synchronizing with your iTunes, Windows Media Player, Skype... and more!
The cool thing about it is that each user has their own "radio station" and stores the music you played on iTunes (and other music applications). So, you can basically enjoy listening to other people's music recommendations and end up discovering more artists you might like.
Also, all the shows by your favorite artists (music you've played) automatically shows on your event page. So, you will never miss a cool live show again! It is a pretty dangerous site... I just signed up a few days ago, and I already have 4 shows I want to check out for next 2 months on my calendar :O Many temptations here...
